Alert archive / Minnesota / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 134, NWS Twin Cities, MN

July 15, 1999Todd County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 15, 1999, 9:04 PM CDT for Todd County, Minnesota. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 15, 1999, 9:04 PM CDT (02:04 UTC)
Expired
Jul 15, 1999, 9:45 PM CDT
In force
41 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Todd County, MN

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.1 hours before the alert went out and 169 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 1999-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1119 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 1999-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1119 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
1812 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
204 m²/s²
Significant tornado parameter
0.1
Supercell composite
7.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMPX 160205 RRA
SVRMSP
MNC153-160245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES-CHANHASSEN MN
904 PM CDT THU JUL 15 1999

THE NATIONAL WEATHER SERVICE IN TWIN CITIES-CHANHASSEN MN HAS ISSUED
A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN TODD COUNTY IN CENTRAL MINNESOTA

* UNTIL 945 PM CDT

* AT 904 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL 3 MILES NORTH OF EAGLE BEND...
  OR ABOUT 18 MILES NORTHWEST OF LONG PRAIRIE...MOVING NORTHEAST AT
  35 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  EAGLE BEND
  CLARISSA
  BERTHA
  PHILBROOK
 
THIS IS A DANGEROUS STORM WITH LARGE HAIL..\.STAY INDOORS AWAY FROM
WINDOWS.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Twin Cities, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 15, 8:50 PM CDT, 14 minutes earlier.

Area forecast discussion, Jul 15, 8:50 PM CDT, 14 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
850 PM CDT THU JUL 15 1999

THUNDERSTORMS CONTINUING TO DEVELOP/MOVE NORTHEAST ACROSS THE
WESTERN FRINGE OF THE CWA THIS EVENING. EVENING UPPER AIR SHOWING
35-40 KT UNIDIRECTIONAL FLOW IN THE LOW AND MID LEVELS. KOAX AND
KMSP RAOBS ALMOST IDENTICAL IN SHOWING DRY LAYER BETWEEN 700 AND 500
MB. THIS HAS CUT THE PWATS BACK TO NEAR AN INCH BUT BELIEVE LAPS
SOUNDING DATA NEAR STORMS OF 2 INCHES MORE REALISTIC. SEVERAL
FEATURES TO KEY ON OVERNIGHT. FIRST IS STRONG H8 CONVERGENCE-H3
DIVERGENCE COUPLET THAT IS INDICATED THRU THE NIGHT OVER
SOUTHEASTERN SD AND EASTERN NE. THIS AREA IS ALSO IN AN AREA OF
STRONGLY DIFLUENT THICKNESS. BUFKIT MBE VELOCITY FOR SW MN SHOWS
ONLY A FEW KNOTS FROM THE NORTHEAST OVERNIGHT. IT WOULD SEEM THAT
TRAINING/BACK BUILDING STORMS WILL BE THE RULE EARLY TONIGHT FROM W
CNTRL MN ON SW INTO EASTERN NE. WOULD EXPECT THUNDERSTORMS
DEVELOPING OVER SOUTHEAST SD AND NORTHEAST NE TO GEL INTO A RATHER
LARGE COMPLEX BY MIDNIGHT WITH TORRENTIAL RAINS. THIS PLAYS HAVOC
WITH THE ZONES AS THUNDERSTORMS WILL BE SLOW TO DEVELOP INTO EASTERN
MN/WESTERN WI AS THE SHORT WAVE ENERGY SHEARS OUT. WITH THE EVENING
UPDATE WILL HAVE THE HIGHEST POPS OVERNIGHT OVER THE W WITH JUST
CHANCE POPS IN THE E AND S. WILL KEEP MENTION OF SEVERE OVER THE
WEST AS WIND DAMAGE POTENTIAL HIGH.

.MSP...NONE.

HILTBRAND

Nearby

Severe Thunderstorm Warnings in Minnesota, 1999Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.